This manual covers the HITACHI EXCAVATOR ZAXIS ZX 350 H, a robust piece of construction equipment designed for demanding work environments. Its engineering prioritizes reliability and operational efficiency, making it a valuable asset for various excavation and heavy-duty tasks. This comprehensive guide is intended to provide users with the detailed information necessary to understand and operate this model effectively. The purpose of this manual is to serve as a complete factory service repair resource for the HITACHI EXCAVATOR ZAXIS ZX 350 H. It includes extensive technical data, circuit diagrams, and information on all major systems, such as the fuel, cooling, engine, transmission, brakes, suspension, and electrical systems. This guide is designed to assist technicians, mechanics, and owners in performing maintenance, repairs, and troubleshooting to ensure the continued optimal performance and longevity of the equipment.